mine will do this if my gas cap isn't on right. if you have a locking gas cap it will do it too. just make sure you give it a few clicks when you close it. But without the codes its hard to say what it is

You can check for the code yourself,by switching the ignition on, off, on,off and then leave in on position. The code should appear in the odometer window or read "done" if there are no codes stored. This happens with my TJ in the winter months. The code is for slow response on one of the sensors. I have never done anything about it and it goes off after a few starts and does not store the code nor has it caused me to fail emissions test. Really worried me the first couple of times, now I think it's just my Jeeps way of making sure that I am paying attention.

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